Mounting for calender knives



Malfrh 31, 1931. F. a. PFEIFFER MOUNTING FOR CLENDER KNIVES Filed April 2. 1929 Patented Mar. 31, 1931 Ultlllkll) STATES PATENT ori-lcs FRED B. PFEIFFER, F AKRON, OHIO, ASSIGNOR TO SEIBERLING RUBBER COMPANY, OF

i BARBERTGN, Gltl, il GBPRLTN OF DELWARE MONTING FOR CAlJrl'NDER KNIVES Application filed April E,

This invention relates to holders for maintaining a gang of knives in spaced relation, for 'the cutting of sheet material, and particularly plastic rubber compound sheeted on the guin roll of a calender, to divide the sheet into strips ott desired Width for appli' cation to fabric strips vJassing through the ialendcr.

@ne object of my invention is to niount the knives on the calender franse in the proper relation to the guna roll, in such manner that they ina-y be applied to the calender and removed therefrom as a group without changing-g' the spacing of the individual knives, thus permitting the ready substitution of another group of knives having a different spacing. ln this way considerable time is saved as compared with prior arrangements requiring individual setting of the knives; and less skill and accuracy are required of the calender operator because the knife settings are determined and lined in advance.

A further object is to provide an improved forni of knife-holder in` which the knives will be accurately fixed in their desired positions and relations, and inay be readily inserted and reinoved by siinple manipulations when desired.

0f 'the accompanying drawings, Fig. 1 is a vertical sectional view of a rubber calender showing iny invention applied thereto in a preferred forni. i

llig. 2 is a perspective view of a portion of the knife and holder unit.

Fig. 3 is a vertical section of said unit, partly broken away, together with the crossbar of the calender frame.

l is a partial rear elevation showing a modification.

ln the drawings, is one of the side standardel of a three-roll calender including an upper roll 1l, a middle or gum roll 12 on `uhicli the rubbe compound is sheeted froin a bank 123 located on the rear side between the two rolls and on which the sheet 33 is then divided intostrips 34, and a lower or 'tabl-ic roll lst separated troni the middle roll by a space for the passage of the fabric strips 35 to which certain .of the gum strips 34- are adhesively united. is the cross-bar corniace. seran No. 351,913.

nicnly provided on the calender frame for inountii'ig gum knives, and on which I suspend my improved gang knife-holder.

1G, 1,6 are the guin knives or blades, of a 'form conveniently made in the desired length from old hack-saw blades by grinding oit the saw teeth and sharpening the edges, and preferably arranged to cut on both edges, so that when one edge gets dull the knife may' be reversed to use the opposite edge. 'lhcse knives are loosely assembled and niaintained at the desired spacing in slots 17 formed in the outstanding flanges of a pair of parallel. angle-irons 18, 19 attached to the face ot 'a supporting plate or board 20. Said board and angle irons constitute a` holder lraine having fined knifeholding and guiding jaws formed by the sides of the slots 17.

The lower spacing slots 17 are made deeper than the upper ones so that the inner edges of the knives will bottom at the ends Vof the latter but not the former. The inner edges of the knives are supported by a backing bar 21 affixed to said plate just above the flange of the lower angle-iron 19, this bar being made of resilient material such as vulcanized soft rubber and serving to take up any slack in the individual knife niountings, to avoid excessive individual knife pressures against the gum roll and to equalize any lack of uniformity in the amount of projection of the several knives. The lower ends of theknives `niay be brought substantially to the saine level by means of stop blocks 22 aflixed to said knives near their upper ends, one on either side, and resting on the flange of the upper spacing bar 18. A clamping bar 23, adjustably secured `by end bolts 2li to the supporting plate 20, overlies the knives 16 just below the flange of the upper spacer bar 18 and collectively locks or retains said knives in the spacer bars by engagement with their exposed outer edges.

At each end of the supporting plate 2O is fastened a downwardly-open hook 25 having an upper attaching jaw 26 engaging the upper edge of said plate, and a lower jaw 27 provided with an adjustable clamping screw 28 engaging its lower edge, for detachably securing said hook to the plate 20 j l show an alternative means for relation with the work.

in a position projecting forwardly therefrom, or on the side opposite to that on which the knife-blades 1G are mounted. rihete tw hooks serve for demountably suspending the multiple knife and holder unit from the calender frame-bar l5, so that the knives are movable in unison into and out of operative Each of the hooks has fixed to the lower end of its free member an Yarm 29 project-ino' at right-angles thereto and formed near its free end with an upwardly-open notch 30 for detachably suspending a weight 3l. rfhis weight, being spaced forward from the fulcrum bar 5, exerts considerable leverage on the knifeholder and furnishes pressure for forcing the knives i6 through the `.Quin sheet on the roll 12and a 33 into strips Si.

in the modification represented in Fig, t, limiting the endwise movement of the knife blades 16 when loosely mounted in the holder before setting up the clamping bar 2S, said-means consisting of a rod 3Q common to the sev-eral knife blades and occuovii holes formed therein, said rod resti g ori the flange of the upper spacing bar 18. rlhis modified arrangement enables the knife blades to be applied to and removed from the holder as agroup, but it is-considered less desirable than the form Yshown in the other views, which permits any single `knife blade to be inserted or removed without disturbing the others. f

ln the use of this apparatus, a number of these gang knife and holder units, in which the knives have different spacingscorre spending to the various widths and spacings of the gulli-strips which it is desired to cut from the sheetformed'by the calender, are kept on hand, and when any change to a different width or spacing of Ystrips isto be made it is a very simple matter to detach the holder then mounted onv thecalender, lift it a unit out of the space between` thek cross-bar i5 and the top and middle calender rolls, until the holder is clear of said cross` bar, and then substitute a different-holder having the desired new spacing of knives. Before removal, the detachablewei, are removed and are 'thereafter replaced when the substitution has been effected. The hooks 25 are mounted wf h a uniform spacon the different knife-holders, and suitable adjustable end stops (not shown) may be provided on the cross-bar l5 for fixing the lateral position of the knife-holder, these stops being changed whenever it is desired to shift said lateral position. lt will be evident that the use of my invention on calenders devoted to strip work, where the sizes and spacings are periodicallj7 changed, results in a saving of time proportionate to the number of changes made, as compared with 'o'ainst said rolI to divide the sheetv the usual system of individual mounting of knives upon the cross-bar l5 which requires each knife to be set separately, the calender meanwhile running idle and the time of the operator being consumed in making a lengthy adjustment instead of turning out work.

The described means of detachably mounting the individual knife blades in the holder also facilitates the substitution and reversal of knives when their edges become dull, by

Vanother operator whose time may be devoted yto that work.

it will be understood that various modiiications of structure and arrangement 1n addition totheone described. may be effected without departing from the scope of my invention. as defined in the claims.

I claim:

l. In combination, a rubber calender having ak gum roll, a gang of knives held in fixed relation to each other, and movable in unison into and out of cooperative relation with the gum roll, and means for hooking and unhooking said knives as a group, on and-from the calender.

- 2.A In combination, a rubber calender havin@` a frame cross-bar and a gum-roll, a knife holder, a .gang of knives mounted in said holder and coacting with the gum roll for dividing the rubber sheet on said roll into strips, and means operable as a unit and attachable at different positions along the crossbar for detachably connecting the knife holder with said cross-bar. l

A3v. In combination, a rubber calender having a frame cross-bar and a gum roll, a knife holder, a gang of knives mounted in fixed relation on said holder, and a hookstructure for detachably pivoting said holder on said crossbar.

4. A multiple knife and holder unit for rubber calenders comprising a knife holder, a gang of knives mounted on` said holder, and a plurality of hooks projecting from said holderon the side opposite to the active cutting edges of the knives and open downwardly, for detachably mounting said holder on the knife-supporting portionof the calender frame.

5. A multiple knife and holder unit comprising a holder, a gang of knives detachably fixed in spaced relation on one side of said holder, and means projecting from the opposite side-of said holder for demountably suspending said knife and holderv unit in operative relation to the work.

6. A multiple knife and holder unit comprising a holder, a gang of knives fixed in spaced relation on one side of said holder, means including a downwardly-open hook projecting from the opposite side of the holder for demountably suspending the unit in operative relation tothe work, and an arm projecting from said hook and having means,

Eli).

for detachably suspending a weight to increase the knife pressure against the Work.

T. A multiple knife and holder unit comprising a gang of knife blades, a holder formed with guide jaws for maintaining said blades in spaced relation, and an adjustable clamping device common to said blades and overlying their exposed edges, for locking them in place.

8. A multiple knife and holder unit comprising a support, a plurality of spacer bars mounted on said support and formed with knife-blade slots, a gang of knife blades loosely mounted in spaced relation in said slots, and means for clamping said knife blades in place.

9. A multiple knife and holder unit comprising a support, a pair of parallel spacer bars mounted thereon and formed With knifeblade slots, a gang of knife blades occupying slots in the respective spacer bars, a clamping bar common to said knife blades, engaging their exposed edges and located between the two spacer bars, and means for bolting said clamping bar to said support.

l0. A multiple knife and holder unit co1nprising a gang of knife blades, a holder having means for maintaining said blades in spaced relation, individual lateral stop project-ions on. the blades for limiting their endwise movement in the holder, and means for clamping said blades in place.

ll. A multiple knife and holder unit co1nprising a holder having suspending means on its upper portion, a gang of knife blades mounted in said holder and each having holderfree lower cutting ends, and means overlying the exposed back edges of the blades for detachably clamping said blades in the holder.

l2. A multiple knife and holder unit comprising a holder having knife-spacing means, a resilient backing bar thereon, a gang of knives Whose inner edges rest on said bar, and means acting edgewise of the knives for detachably securing said knives in said holder.

13. A multiple knife and holder unit cornprising a holder having upper and lower slotted spacer bars, a gang of reversible knife blades loosely received in the slots of the respective spacer bars and having means for limiting their endvvise movement, each of said blades being sharpened on both edges, a common clamping bar detachably bolted to the holder between said spacci' bars and located adjacent to the upper one, and a resilient backing bar located between said spacer bars adjacent to the lovver one, for supporting the inner edges of the blades.

ln Witness whereof I have hereunto set my hand this 30th day of March, 1929.

FRED B. PFEIFFER. 

